metal so that the paint does not peel off in

Question

I immediately subscribed after watching one of your videos. I noticed that metal was exposed on my archway when the paint started peeling. Thanks to you, I now know that the metal is called a corner bead. How do I cover the metal so that the paint does not peel off in the future. My three year old great niece so the paint peeling and continued to peel more paint from the wall